Question

The frequency of the electromagnetic wave, which is best suited to observe a particle of radius $3\times {10}^{-4}cm$ is the order of

• A. ${10}^{15}$
• B. ${10}^{14}$
• C. ${10}^{13}$
• D. ${10}^{12}$

Answer 1

The correct option is B ${10}^{14}$

The wavelength of radiation used should be less than the size of particle.

$\lambda =\frac{c}{v}\le 3\times {10}^{-4}3\times {10}^{-4}=\frac{3\times {10}^{10}}{v}\Rightarrow v={10}^{14}Hz$